1 /* stats.c, coding statistics */
3 /* Copyright (C) 1996, MPEG Software Simulation Group. All Rights Reserved. */
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35 /* private prototypes */
38 unsigned char *org[3];
39 unsigned char *rec[3];
44 static void calcSNR1 _ANSI_ARGS_((unsigned char *org, unsigned char *rec,
45 int lx, int w, int h, double *pv, double *pe));
47 static void calcSNR1(org,rec,lx,w,h,pv,pe)
54 double v1, s1, s2, e2;
76 /* prevent division by zero in calcSNR() */
80 *pv = s2 - s1*s1; /* variance */